On some Macs, there is a problem with running Tonebridge as an Audio Unit in Logic Pro X called the “exclamation mark” bug—when adding Tonebridge as an effect in Logic Pro X, it doesn’t load up and shows the red exclamation mark instead.
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So, to make Tonebridge Audio Unit work in Logic Pro X, do the following:

1. Be sure you have both Logic Pro X and Tonebridge installed on your Mac.

2. Open Logic Pro X, then on the app menu on top open “Logic Pro X”, then “Preferences”, then “Plug-in Manager”. A big dark window should appear.

3. In Plug-in Manager, see the list on the left. Scroll it down and open the “UGTB” folder. You will see a list of one Audio Unit which is the Tonebridge Audio Unit.

4. Near the name of the Audio Unit, find a tick that says “AUv3” and turn it on, if it’s not turned on.

5. Click on the name of the Audio Unit. The whole row should become blue. Be sure that the tick near the AUv3 is turned on.

6. Find and press the “Reset & Rescan Selection” button. The Audio Unit should now be rescanned and fixed. That’s it!

(Note: all the previously applied Tonebridge Audio Units will be reset too, and you will need to apply them again.)

Please let us know if this worked for you or not. Cheers!

P. S. For advanced users, try to run this command in the Terminal app:

sudo kill -9 `ps ax|grep 'coreaudio[a-z]' | awk '{print $1}'`

This should restart Core Audio which is the main cause of the red exclamation mark bug.
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